Patents by Inventor David H. Chadwick

David H. Chadwick has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Fixed bed catalyst for MNB and DNT hydrogenation
    Patent number: 4400538
    Abstract: The instant invention is directed to a process for the production of an aromatic amino compound of the formula: ##STR1## wherein R is an alkyl substituent of from 1 to about 18 carbon atoms,m is an integer of from 1 to 3, andn is an integer of from 0 to 5,comprising subjecting a nitro compound of the formula: ##STR2## wherein R, m, and n are as defined above, to gaseous hydrogen in the presence of a catalyst, the improvement wherein said catalyst is an activated noble metal in the form of a screen or other coherent body.
    Type: Grant
    Filed: June 11, 1981
    Date of Patent: August 23, 1983
    Assignee: Mobay Chemical Corporation
    Inventors: David H. Chadwick, Thomas E. Boyd
  • Hydroxyl containing materials from distillation residue obtained by distilling hexamethylene diamine from a mixture thereof with by-products obtained in the hydrogenation of adiponitrile to produce hexamethylene diamine
    Patent number: 4115304
    Abstract: The instant invention is directed to novel hydroxyl containing compositions and the use thereof in producing polyurethane resins. The novel products disclosed herein are hydroxyl containing materials produced by alkoxylating a distillation residue obtained by distilling hexamethylene diamine from a mixture thereof with by-products obtained in the hydrogenation of adiponitrile to produce hexamethylene diamine.
    Type: Grant
    Filed: September 14, 1977
    Date of Patent: September 19, 1978
    Assignee: Mobay Chemical Corporation
    Inventor: David H. Chadwick